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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8afbe38accbe5359c6fca4003b59ebe4d2a8f4d4cc02d5a861a637003cf4546b' 
  AND token = 'WFHvWEPuNw5DKyF9f+0d7vJyUxy+nDQpFnTMq+Ygqis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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