SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c664469e57a81c7acdfa8d426050528a7c916970d2478127e995ed55aba08f81' 
  AND token = 'EInYSHw3s2Uo+co/G61uxqVZIOWpmlS9CZTgP1Aw7Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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