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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cf97c705d5471a61ae6e831807c704cf389f4f0d14431fc33416c38d5607980' 
  AND token = 'olYisr7Wwm07O8N6FsLfySWwoite0T1xfZ5lcdUz8Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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