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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd362f8cdfd41d080f9712cc7626f06b00ae51424c12cc7c404dc016390c35380' 
  AND token = 'miBREbZgsLv8n7CYhzLw0L+1Fzm+R3X7Ekh8eFdjGHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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