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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a542824153e1c4c65f1451978456ce4929e01510aaf23f33eeb1146dfd14daec' 
  AND token = '+T0ME7oGTRMvUdV45GrojaYWTibsjcURlVd1HihTYZY=' 
  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"
    }
  }
}