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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc11b1708cc0e30b6527ddc4638ee6faac7fab710003b8b42ab7cd8fbb81d91' 
  AND token = '7j32cSTQ7KKWyDRoiUAaXuGr7psCX6qpNqAUmZX5ZmA=' 
  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"
    }
  }
}