SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22c318d82fcd9df54cc8cb2a1bc88f304073c8406942fb265f5f980b97cea2c6' 
  AND token = 'X+iLzH/aJJyKs4xps7GnmNUBvYC8X1c06VSQnYuAJBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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