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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '410a243dd340fd2a68c511d547b73641cc33c625b0d07bfc2a90b6f97044b5d4' 
  AND token = '2Ikz0TIRbV9sIoIsdXwC1ecLlVfvyYdtASZZeYBHHJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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