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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '318fe9b172830f39dc1c1f3fb7452948c317f1184e740dd7fe0dace2f1693e13' 
  AND token = 'E6cC8J+qReAu1nt0UWid64W04Awo29nO5AsJvAjnRMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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