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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1d498cb46662a4c123c19fe8b60a73a2f79cc448214ecb8aa32436956f80d3d' 
  AND token = 'LUHy+wuOQrJuPlg6AivitQ68fs5heMYkfRL0q7NXA+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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