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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddefa1e0a05306fe8b96a75bd7b5be5309f8fc3185c549e776a124f9ad37643b' 
  AND token = 'f/YYYbIdJ4dAaSczVjvPUQmDPc0z6oWEm8ly7l17pxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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