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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a722959beceef1f03e6343bfe22b94d007c95a9f72360024bf79d4edbb4eb7db' 
  AND token = '6OQldtmHfedPNKWwxOVDAPpd3Z5kS1W7aNeFp+qnuHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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