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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7e4698dd628dc1af9f81046d90c77b372c4291d14171025a5515eb64b3c6be3' 
  AND token = 'Q67vWolUKebILahcmW7W0dKpwlXgJykLhvzMkrh0v2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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