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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe9a5781e4242ce8a7ce3bdf332da2c769c20224685c713fd4c3e48498f3dea' 
  AND token = 'lBZ2kisT3lqreDWNUNpCRs8lQ4CivsQhh7J8kTaC/bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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