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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '526d415ca5141e8de312689c4d6f98f8393251f1fe85691b7758f59fa9406141' 
  AND token = 'WqHReJtIMEMwPmn5mBiy6Z4BrnicYXslPpvz1b6na3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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