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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d70510b9f8af9d5d16a12b8141e8a96437f75bb45a7266f8c0994976b56346' 
  AND token = 'NrcVbQ5d8u7ISnaFJoJe4NQnIgPaV4pG46nzPQ8Vjf0=' 
  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"
    }
  }
}