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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f327ee8fde9631981f6145ffffd95f3c8f19a951a2589227609a9fda54c2ab8d' 
  AND token = '4ScFgXegffdhIH9sS1YEwUSTANLFw4+lSlJFU+eOEbs=' 
  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"
    }
  }
}