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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab128cbc870b586f355c342a0cde8e0721b583e0d669ca53b539870ce1d4fb92' 
  AND token = '5mweQNfS+M5Z1u/HUYiqZygyDWP+TUXGzS044tPUMTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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