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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ebd941135340b24443a40f16bbbb65b11adb81dccb42e5c2871518ab714c3e' 
  AND token = 'jyWHdLgronLHRGXN/JQkzfRpv/1zcMFt0iaypi9DAoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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