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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d1a6383650a2e6bb60f7552c6bc6b72291c1f206793b72851e4a9c28213fdf9' 
  AND token = 'PjfZaH9lzRWltboOzjUcu7VA07ocHCH/o1k6rT/wGEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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