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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8600bd29177ce5aebe0f15d3af26adcb26434616c68315c5c40fef2a8218ac35' 
  AND token = 'DKhs7/iSI88H29RmWG1SalY9k0dc5W8hqo9EibcQ93c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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