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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f836859ee622552fd8fcef98d84c081917534c8629e43c49551da564701d982f' 
  AND token = 'oUAxhsKnCidc9ViRYF7k4a5eEHFFxp0PL3pU3joyrvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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