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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '546212ce1fe39cf5a9e7f49d751a06003e2e145f0c9cf611c84d4f864882ef9b' 
  AND token = 'NAFmV9f+rpU6p7pxDwV8UkkoyeF0ddxYxi+S5HWy1DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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