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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29c766ff57f10cae706cbe7f6a9f2e293825c2ad697d0da6dacec860b222da94' 
  AND token = 'zJzx3L29eTC+7lA1Adqz78BWg20X942VcSB4DRRvnCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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