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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd85f96b9527548a889bae032b9b38afde594a2b3332a94aae18c61ea303767b8' 
  AND token = '5Bx2d372Xjg6+i6fFop0rrevp+lznwEHVBvUPE6CMPk=' 
  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"
    }
  }
}