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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5bf0f80b62ea7c256112520f433030eab897d973c7e373f2d6e00f4fe5ed3f4' 
  AND token = '8dVSQSN6nDmwfPh691BATXVLzvM+sQ9lSkrlEJogne8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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