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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31bcd17c027cba0d08cf575ebb5f84b86afe68b0ab31c7821e7d0d75080e0bc3' 
  AND token = 'LyzKjWumxDI1ZelNgOVCRmJ9jCXmJ4aLCyvX4ToicNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}