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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a12e2720fccee6333aef2913fe41df043f67cada61e2472532c730a59adf5360' 
  AND token = 'Z6jknUL5Wm8tTQvLNnc0/G/2u69q1VDl62gF7z1rFJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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