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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e930b4b496d97184d1237a5f39f270429aef42dd0b2bd1b40371e63d1212858' 
  AND token = '0tDfmtIrc42ia6qOiCpg1u00Wr35UU0hxY4TB4Py7A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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