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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5846685bb3d3d72950275fd3a4836976f48890d60fe5073b55684f0ececde749' 
  AND token = '2+TRj024f6NPd1eF/1iBed47fRGxaLZo5Dpp/XHh4Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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