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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54009f4f480aae0f64e3004ac9dd0b348e0c18460250284c6da22bc5f214f424' 
  AND token = '8n+KvvVvNmdTxbfgqIZP3yQgLBpO4F11LWuWz/iEUYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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