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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3c958b8f813bd8d69272a060cda91452b03b70ef04b8d1f2bd8d872cc6817ae' 
  AND token = 'ASYoArdR+piTiDuCWLkA3Y4fXbI+mkPrPPsOorQsfmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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