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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e4a40f2090c8798befa29286bd6caf915bb4de6501861d98aa8cc5c0a2aa8c8' 
  AND token = 'b7P8/wiAfTlIskzx+IrwlaQukygdgA7PLokRCpnLIpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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