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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4809546945f863c46c8522683accb03b2f3756b382f9684496ea413a87854805' 
  AND token = '92WUWbdmyy7jmD+HNr9h7Lionbz7V0GyC3mOMyVY304=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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