SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fa1e5b3479003b47c570fe143263460da44adce5de6f635ed747b167c02ef70' 
  AND token = 'Lzksql2uKAem28PvhRq9y+6CEG/cgGEISFi+MjI+cBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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