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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bf8d59e7f76b9b2089d87f7aac44ff670558dc3064bf3ebc9dc9b5496fb3e14' 
  AND token = 'qig3FA28+CvaV+05KXB1mJ64I5eq14JcCT9EyCd/eRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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