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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b629480d8595e110f271c7ac9f72626a900e387b28f18c7ec3f6f048a72af7fd' 
  AND token = 'm8EA7KPNWEjNu6CecQ5/aBorgvZpd+pM9MkYXJtStBU=' 
  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"
    }
  }
}