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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bab4e85f80bd5c8eff3c77d338da42e0b6947a844e6aa332d8e9b92d0723f46' 
  AND token = 'sKpzQgK0/OU4dWgtjAhDHqg8JWhsvke1CFM87iii3lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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