SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24697e1e295ae91404fd20262f77587bfc9802d5a570b4263e8a1778596a0ed5' 
  AND token = '9MfW3j9sLB+BUm4sVpw+cphG03+txQ2rJiAh6AN/QNg=' 
  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"
    }
  }
}