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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54eda1698e27e6ce0a9eefa67f73e902a98d6b077592e5506776de9d2147d59d' 
  AND token = 'RP3T4wXOAWgUVnqCx4dUd9D0fuwHcWHrbzC5xx54ElM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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