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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '821ffb882d800b560f11d54e0e38cea7005d6c592c612facec3b5ee9e1992d50' 
  AND token = '/ZxVpUtOQgibui8cvX7r3/UxeEb9aaeRvX8si7fgbOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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