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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c245bb10cec7e37583f35c0ddc3265c6d0ddb626fa64faa9b8d3210c502a513b' 
  AND token = 'TxhpNuWq/Aa2qYLDiREtDrL92HS2DpB/tW5ROFgDZew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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