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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19435755878f3a2f82a4a7754e829ec967869f70c754b73264d8438e54e2a4b7' 
  AND token = 'RE6IhP7M79HeX9Oj/jzrHzu5YxnTczdt7axBMm2OAKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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