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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f705ca2e5632ac86bdacb73d2ca82989a0a8020ea0d1a322ad8e3dd6083c0d9' 
  AND token = 'a7ZDHxPVlVwZkzHupk2LhIovNbf6tjudRCe4D0yjlFE=' 
  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"
    }
  }
}