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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74476811d15937705acf5d92e16d84eea3a97b11d4c8a19523f4dd506f9a2755' 
  AND token = 'Vl++Qyu1+C4Jsfi/2FCdrOxJ5qBu2yXyB6qItKOVFg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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