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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b28f485b5c86c96fde2c0411f7b6a42af1129bad18b71301b659c7f4478d737' 
  AND token = 'FyqMNNiv7+4PT9VRvgVGa5zsmZkE51bPxL3EummG1RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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