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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f72ddf39536911260d083370f3b8ee24c13cb44ab547d3ac29b6be33e4495407' 
  AND token = 'ghK13KV3QOR8UymD8S9LN2hIy5IjwrqR21N+U+MfrXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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