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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '838002ae65d28dee8e438a49a4088bc211921cce75bd703b4fc370a8ca8f6238' 
  AND token = 'haLYc4ppE23WIVKVLPvbloudTGRczclkMXDoHm88b4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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