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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9640e0c13cc3e796c0f58ec30bcb87953f1e0815783a6e93843ff78b8cf30b86' 
  AND token = 'KaQtsPKU2V7LDbmv7pdkZzI1v8Q3s0kB/aKpshNgJ9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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