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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93f3847bc130a50b6acc5d452bbb92b17e33c19bf0380f89a6d429ebc1ed7ff' 
  AND token = 'WK7iy+GZ6CQhpzH72837Z79m4KSXmQpqKno15NI3/1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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