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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b562c4b072ac2a2f286e86609834dc5de58306a401f04972db0004627af3d67e' 
  AND token = 'AcINxnrz+b2OU42fK5zbX9OISdN/A85GaON8ZGYPOQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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