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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fd55c1009e95f855f6a84437f93c87d899f0eccbdb37d6c793da07236ee63ea' 
  AND token = 'Y2MTBB5wRmNW8cLYS0PNXv4Q3Exyfva/N4nqhYsQL74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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