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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c670b22803b408d285c5131827b5257052baa8323aca7dfe669b4d57409af177' 
  AND token = 'BuDfUKaecBvEkK1vSsRptQbo8XIZeXca2Y48i/dBrLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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