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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ef88e8a3dd2ec968709c5da3b12a864fdbd5e64f6b812a05d492cced9e9a084' 
  AND token = '7/2Vj5qP8XL3sqapX5D6Yiorzphp6FBAD208onJTJkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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