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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0342eaaee7e65b1283bdcc377a08e6522a6faaa7c0adf99ae5a373e8d2681217' 
  AND token = 'mPaIwPvj380QWSHG/fLWVZlPdssv/KaRPS2/7UFESng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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