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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46b86a2a6e1bb9af2be2835b0f1a95b892fdca1d823cad1611ba57770add5802' 
  AND token = 'Cdsz7BhCwj28cs9X014RZKGxUmON1c31/2Fh7UO6/sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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