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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5774d297f50d07aa7a0a701f531a0806f0e98e1c49998c84a0bbf2a8d2d53d11' 
  AND token = 'BRoJgp6NWeJE5SnzKE6jMbR8TlkW2cOZN7LfsuPuWn8=' 
  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"
    }
  }
}