SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b28969f4d1e281d28e74b3c913651fbb2148f8cc17048bcc8784aff3c4f2936' 
  AND token = 'IKiLM/G0xHYcZxmvyyhyJ5mr7qowiU2qIwAVA4S4NMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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