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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e723b5ff8e36221bb994f9c1aa78052120702502546c689ed4260b50d2c57d9c' 
  AND token = 'Aa20TaKhkEXonQQ3edWWZX/3IKAbSLQ33nXkzPUMDqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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