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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9efb2981956bc63fbcb44427a7b7a344bac93b9eb6e8b58e1f51d9613e712fc' 
  AND token = 'DmBM7uOiUQut05olXW7zkbLcuVo+7nIyv4nGy5Y33ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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