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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0255bec5511bf8daaca067cb801a35c30e1f4dfd52490b71c6f0e73907abae6f' 
  AND token = '47gPD/fLmPV7X7DqdqJpcZ6UDTSIXHW01x+zeN22/Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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