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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac18045f47740a02aa6a305ca24dd9b0dc9e9f3e0cd035af9e2990576d91d047' 
  AND token = '2uMw1AwfMun2bACZ3ezp8/vrfAsHOBhQ1CqFkh2XOzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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