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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc6a03303667ea70405621a37a7b39d4e291e84043ddf9809eac30e7554d6bb' 
  AND token = 'H7fmhx6q6na64+hccEiThk2wHCccdJxkRgILPaW5hAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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